Vibrating screen



Feb. 5, 1929.

H. S. WOODWA RD `VIBRATING S GREEN Filed Oct. 28, 2 Shets-Sheet 2 Na *m Wood/faza;

Fatented 5, 192% lllhlllhl) STATES HEBBEBT S. W'OODWARD, OZ* GABBONALE, ENNSYLVANIA.

VIBRATING SCREEN.

Application file October 28, 1925. Serial No. 65,28%

My inif'ention relutcs to apparatus for siftin p' material by effccting Vibration of a screen or foraminous plate on which the material is disposed, a. principal object of the invention being to provide an apparatus for this purpose embodying features and advantages not found in devices hitherto proposed therefor. To this 'end my invention contemplates the provisionof an inclined screen on which the material to be sifted is disposed, in association with means, including a Vertically disposed flexible member rigidly supported at one of its ends, for imparting to the screen a series of impulses in a direction substantially normal thereto so as to effecta positive, rapid, vibratory movement of the screen. My invention further contemplates the pro- Vision of means for rapidly flexing or bending the *liexible member' to and fro in a horizontal direction or plane in association with means for translzning` the resultant Vertical con'iponent of the inovementso set up in the member to the screen but in an increased amount or amplitude Whereby a relatively small Vertical shortening` or elongation of the member is operative to induce a relatively considerably `greater inovement of the screen.

Further objects of the invention are to provide means for conveniently adjusting the angularity of the screen; to generally simplify and improve the construction of Vibratory screens of the charactcr to which the present invention relates, and to provide an apparatus satisfactorily operative for the performance of its intended function which is simple, yet rugged in construction and not liable to get out of order under the conditions of operation and relatively rough usage to which devices of this general Character are ordinarily subjectcd.

My invontion further includes other objects and novel features of design, construction and arrangen'ieut to which reference will horeinafter be inade or which will be apparent from the accmnpanying drawings forming' a part hereof and in which lig. 1 is a side elevation of an apparatus constructed in accordance with a preferred embodiment of my invention, a portion of the side wall of the screen frame being' broken away to show the screen proper. Pig. 2 is a rear end ele- Vation of the apparatus shown in Fig. 1 and Fig. 3 is a horizontal fragmentary section on line 3-3 in Fig. l. Fig. is a detail View illustrating a slightly modified construction of ono of the elements of the apparatus and Fig. 5 is an enlarged fragmentary Vertical section online 5-5 in Fig. The same symbols are used to designate identical parts in the several igures.

I am aware that it has hitherto been proposed to effect Vibration of a screen through the medium of a Vertically extending fieXible member attached at one end to the screen and the other to the base of the apparatus in conjunction with means for imparting to the member a horizontal amplitude of vibration, an apparatus of that Character being` disclosedin U. S. Letters Patent- No. lflll, granted Jl-ipril il, 1922 to John Bland for improvements in screens. ln such apparatus, however, in order to effect a Vibration of the screen in relatively considerable amplitude it is necessary to impart to the. flexible member an excessive horizontal vibration so that while such apparatus is entirely satisfactory for use under conditions in which but relativcly small motion of the screen is required, they are more or less iinpractical for use where a relatively large n'iotion is desired. An important feature and advantage of apparatus constructed in accordance with the present invention, thcrefore, resides in the ability to therewith effect a relatively considerablc inovement of the screen With a relatively small horizontal wibratory morement of the llexi'ole member as will hcrafter more fully ap pear.

As shown, the machine or apparatus colupriscs a base, generally designated as B, and formed by a pair of laterally spaced longitudinally extending side members 1-1 connected near their ends by cross ties 2-2, the base being preferably of relatively heavy construction so as to form a firm support. Respectively disposed above the side members and supported in spaced relation therefrom, preferably as hereinafter dcscribed, are a pair of longitudinally extending stringers 3-3 conveniently of Wood which may be connected near their ends by cross members flso as to form a rectangular, open sub-frame, generally designated as F.

I prefer to yieldingly support the subframe above the base in any convenient Way, for example, by means of Vertically directed boits 5 extending upwardly from near the forward ends of the side members of the base. and freely through the ends of the stringers and surronnded by coil Springs 6 and *i dis- Ill) posed above and below the hitter, a vosher 8 and nut 9 on 'the upper ends of the boits :itiording means 'for adjustiog the tension of the sprii A substfintiiy similar con- :1:1i'uction inny he en'ipoyed tor supporting the real' end ot the sub-'hm save that a I let Spring 10 is shown as utilized in ghxee ot' the coil spring 7, ;is under inostconditions the use ot' e flzit spring ot this point is preterebie ns tending to prevent lete'ul moveinent ot the stringers and in turn ot the screen (hiring` the operation of the machine,

ch hitcrzii ino ueut being generalny undesrohie ue tenrls to set up eert in in the screen which are ininii- 1oeul Yihrai' n ne cal to the c nicht of the heat resau r`he nn sitteii 1;; supported upon ;i screen gen'ei'uliy i' truciion, that shown he of any euitable oc 's cieariy cx'idont escriotion there- Vt 11m7; he ed With rehiorder t sivo y more along the sereer under t toi'v action thereof, the hithe n'irtezriai inny progrester is supporteu in en in'eiined position with its r :ir end, that 'z right hand side of i, i, pointu" is Viet-ed as Fig'. l o cohsiderihly ele- Vhtezi above i nid wi ich lotto-f is supported 'ui e Way for olcihetlen about i t'i i e'tendingzj trans;- \."erz ei},' o'i the upper: t '"'his' Qimport nmy he c Venice of the njor ii w shown in Fi mi :mi

xi'c'chs, thi or ci' i nt. heh erutive o t t-h S which coniprises e Vertica and iett hand threfafe righty i it: pr rxnieft With a hexugonai i *i te' to at rd fi grip tor :1 Wrench.

end ot the l'od is threuded into :L suitable v:se holted or otherwise secui'ed to the J: *ingcr and the upper 'end into zz head 28 having a tmnsverseiy disposed bore for the reception of the enL ot the sha'ft 18. t will he appzirent that if a pilhu' of this type empioyed the Vertical height ot the sha'tt uhove the stringer may be readily zidjusted by turning the red So us to rziise 01' lower the :nijacent end ot the screen which is frequcnti); zitmntuge.

The rezir ein'L of the Screen is supported through the l'neduin of the niechunism by W c-iitsvii Tum 1 iretion is etijected and which Wiil 'ihedgold niechanisin or means c'on1`n}=- i L air of struts 25, '25 firmiy supported on each st 'in-gier, :18 by Chimps ;md i. ,1 w f noi/;fx genemiiy uen'igneted zm 2G, 2?? 'the 18 of each *i :'z'iz? ot etruts h J! apart, :md es und their upper onds ,7 inclineii imi'zirit'y tone-ni ench ween the upper ends ot ezieh pair ii'nitj-,f chunpoii, as by holts 7 :{ihle ineinher 30 So that pends between the stru'ts, it being of course understeod L1 t the screen is nispose'l heti i'esoeet'ive ;W rs struts and :ut-

The tiexihle nienr 30 are nreferzihly sii'nihir in construci he mode of Wood or metal 'er to einpioy the tornrer, end of each member is pivotffiiy suitable way t 2. .suhet Subjacent fitringer 2-3 :1111i 7 V i tnereto :1tits iorword 'oijgh the medium oi ;i

. 2 mi by the stu '"g'er und :1 pivot. pin or stub shutt 33 e11 'cnfed therethrougfh ero th w to boss 3;' with Yv'hich the :zdjec-'Wt emi ot' the iei'er 's provided. fico con; 'e-:\ `veen the end o'f the flexihle inenher a.

L w v i nie lower max he nnule .in :'uutehiz:

i on the level' :iui

thron; 1 :z h

f throuijh z: bus] ino' or s oeei'e 35 s-:eci'refi to J he end ot h, n nhe f i 1 iuin ot :i strop i :oV x' ,i A i ,i o C i preterziol" t of W' z0 having "ireiy hingediy cohn ,cteo i end to the Screen end hfiviifig tll r thrczuied enf joinod by a turn hu o,

41. Convenienty the hinged connecshett.

tion between the rods 89 end their respective ievers inny bo efifected by providing` strsns- Vorsely extending zixle or shui't 42 the ends ot which respectively extend through bosses 81' on the ends of the levers end other bosses 39' on the ends ot the rods, colhirs on the shatt serving` to hold the perts in position. In :i substantielly similar way the counection between the rods -iO :md the screen may be etliected, that is7 through the medium ot zi. tr;` isversely estending siio'i't extended through bosses -iil' on the ends ot the rods amd piliow bloels cz' ricd by the screen, colhn's etS sex-ring to hold the ijizirts in position. lt will thus'he eppurent that the levcrs ll :irc supported Yert-icnily by t-he 'fiexible members which, in turn7 are carried by the respective peirs of struts7 while the reer end ot the screen derires its support troin t1 ile .tree or reo-r ends ot the levers through the medium ot the rods and turn buckles; end 'further, that by ediustment ot the tur buclles the enguhirity ot the screen may be rendily Varied. In order to tie the struts und upper ends ot the flexible members together utie bar 4-8 may be extended transversely through the letter end rigidly secured in position therein.

liezins ere proi'ided 'for ropidly vibrsting or bending` the fiexible member to :md 'ro in e horizontel plsne and while eny suitable means may be employed :tor that purpose, I preter to extend o sho'tt transversely of the members end support its ends *or rotat-ion in journals 5.1 securely bolted to the fiexible members substzintislly et their centers, this sheft being` adepted to be driven at high speed in sny convenient way es by e belt (not shown) pessing over e pulley 52 mounted on e shzi'tt. Upon this sheft I may mount one or more elements 53 edepted to rotute with the shel't und each provided with :i weight which inny proterably be made udjusta-ble townrd or from the center of the Thus when the shei'i't cnrrying the imbehmced element or elements is roteted st high speed, 21. horizontol vibrzition will be set up in the tlexible members so als to cause them to bend or vibrzite to end tro as indicated by the dotted lines in Fin: 1 with consequent Yerticzil motion ot the lower ends ot the members which is, in turn, eiic'tive to rnise the levers ;'i trom their normal position and rcturn them thereto or, in other words, to oscilhite them aboutthe shoitts 33, since the upper cnds ot the members are incspoble ot en); movement whetsoever. Since the connection between the tlexible members end the levers is at a point between .the ends ot the letter end es the 'forward ends ot the levers ere hinged to the stringers, it will be opporent that the movement induced et the resr cnds ot the levers will be in'oportionzitely gre-liter then the moif'ement ot their points ot connection with the flexibie members, so that ecomperatively smell Vertical movement of the flexiblo members will result in e considerabiy greater movement of the tree ends ot the levers., which letter movement is trensinitted directly to the screen. n consequence, the extent to which the flexible members must bo bent or fiexed horizontelly or, in other words, the zimplitude of vibretion which must be imported to the n'ieinb-ers to induce or bring about a, predetermined emplitude of Vibrzttion in the screen, is relzitively smellV so that under operetive conditions said members ure not subjected to s bending or ilexing moment suiiicicntly great to overcome their elnstic limit and which might thus tend to cause them to break while7 on the other hand, excessivo unbulzineed :torces with consequent undesireble Vibretion end ie-r to the whole epperatus end the building in which it mity l e instulled need not be employed in order to etllect :i sutficient vibintion ot the screen to properly sitt the niieteriel disposed thereon.. Additionslly, it will be observed that the anguhir inclinution ot the screen may be readily edjusted by means ot' the turn buckles and that the whole eppsretus is so constructed that there are no parts which ere likely to become loose or get out oif edjustment under operetive conditions. rhis is en important advantage of the epperzi-tus since the constent Vibretions which are set up in machines of this general Character when in operation here o merked tendency'to bring about o loosening` ot the parts it the some is possible.

`While I he've herein described end illustreted with Considerable perticulerity ,a preferred embodiment of my invention I do not thereby desire or intend to in any munner limit myself specificelly thereto us the design, construction end errengement of the various parts inny be modified it desired from the precise 'forms towhich li have re'terred without depztrting Afrom the spirit end scope ot the invention es defined in the eppendcd olnims.

Heving thus described my invention, cleim 1. In :i machine of the class described, the combination of a frame e screen mountedon ,said tronie and adapte-d tor vibration with espect theretoS :i itlexible member rigidly secured et one cud to the tronie, means carried by und edupted to vibrete the member, means carried by the 'rumc end connecting; the other end ot said member end said sercem :md errsnged to import to said screen nn increment of the wibratory impulses generated in said member.

2. In o, 'machine ot the class described the combi stion ot strome, e screen mounted to rock on said reme, e truss comprisino' reletivcly' inclined struts mounted on' said i'rsme, o vibratile member supported by said truss and depending theretrom, n piroted lever havingo :tree end, means connecting said endl member Wit-h said lever intermediate its onds and supporting means for said screen con nected to the free end of said lever.

3. A machine as speoified in claim 2 and comprising` means for efecting Vibration of 'he Vibratilo member in a horiZo-ntal drection.

4. 1711 a machine of the class described, the conrbination of a supporty an inclined screen pivotally mounted on s 'd srfliigorta a lcxiblo member ifncans adal 1tcc.. (o, genorato Vibratory impuliles i-1 a horizoiital oirection in said member, and means c meeting: s'ild member and screen and arrai U'ed to transpose said Yibrato-ry impulsos into 111a0"'1ificd form and to direct them to said scrc n in a direction substantally normal to the plano of said screen.

or on a suppor- D member carried by Said frame. mc effect Vibratory impuises in said member predctermincd direction and means com' zcting said member and said screen arrangc to transmit an increment of said Yibraor im pulses to .said scrcon 'ubstantially normal to ber' and the screen folie` translating the rosultant Vertical component of morement of the free. end of said fleXible member to said screen in magnified amount and in a direction substant-ially normal to the plane of the screen.

An inclined screen supported at rolativel'y spacod regions intermediate its length, fievi lo member suspended at one end and ca rying means for rapidly flexing or bandin said niicmber to. and fro, in a horizontal di ction, and means carried by the frame and interposed between the other end of the member and the screen for transhtting the rcsultant Vertical component of morement the free end of said flexible member to aid screen in a direction substantially nornal to.. the plane of ;aid screen, said trancvating means comprisinp; a lever and link con- 11ccti 1 between. the member and the screen arranged to transmit to the screen a greater Yibratory inoven'ient than the total Vertical component of the movement of said ficxiblo member.

8.,v machine specifiod in claim 1 in which said connocting means include a level' piroted at one end to the frame, an adjustable link cxtending fron'i the Other end of the leYer to said screen, said flexible member being connected to the lerer intermediate the ends of the latter.

En Witness Whereof9` have heremito .set my hand this 24th day of October, 19213..

HERBERT S.4 YGGDTWRD. 

